Lathe-chuck.



:C'. F. WOODFORD 81 0. S. ROCKWELL.

LATHE CHUCK.

APPLICATION HLED DEC. 30. 1914.-

Patented June 4i, 1918.

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LATHE CHUCK.

APPLICATION FILED DEC. 30, 1914.

Patented June 4, 1918.

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LATHE CHUCK.

APPLICATION FILED DEC. 30, I914.

Patented J fine 4, 1918.

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CLF. WOODFORD & O. S. ROCKWELL.

LATHE CHUCK. APPLICATION FILED DEC-3 1- I914.

1 Patented June 4, 1918.

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WNTTE STATE8 PATENT CFFTFE.

CLARENCE FREDERIC WOODFORD, OF WINDSOR LOCKS, AND OLIN S. ROCKWELL, OF WAREHOUSE POINT, CONNECTICUT, ASSIGNORS TO E. HORTON & SON COMPANY, OF WINDSOR LOCKS, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LATHE-CHUCK.

Specification of Letters Patent.

Patented June 4, 1918.

Application filed December 30, 1914. Serial No. 879,784.

To all whom it may concern:

Be it known that we, CLARENCE FREDERIC Voonrono and OLIN S. ROCKWELL, both citi- Zens of the United-States, and residents, respectively, of Windsor Locks and Warehouse Point, county of Hartford, State of Oonnecticut, have invented an Improvement in Lathe-Chucks, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its purpose the improvement of lathe chucks, and the various features will be best understood from a de scription of embodiments thereof selected to illustrate the same, it being understood, however, that our invention is not limited to such selected embodiments except as necessitated by the appended claims.

In the drawings accompanying this description Figure 1 is a front eleyation of a chuck selected to illustrate our invention;

Fig. 2 is a plan view partially in cross section; 1

Fig. 3 is a section taken on the line 33 of Fig. l; v V

Fig. 1 is a partial front elevation of a modification Fig. 5 is a cross section taken on the line 5-5 of Fig. 1; and

Fig. 6 is a plan view of the structure shown in Fig. 5.

The body 10 of the chuck is secured to the face plate 11 by the face plate bolts 12.

Sliding in properly shaped guideways in the face of the chuck are the jaw-carriers 13 which are provided at their inner extremities with nuts 14, each of which is provided with an internally screw threaded hole in which may turn a correspondingly screw threaded actuating bolt 15, it being understood that there is such a bolt for each jawcarrier. Integral with each of the screwthreaded bolts 15 is a pinion 16 provided with a shank 1.7 in the outer end of which is sunk a Wrench opening 18.

Constructed to slip over the end of the shank 17 and to abut the back ends of the pinion teeth 19 is the ring or thrust collar 20.

So located within the chuck as to have its teeth 32 mesh with the teeth of the pinions 16 is the circular rack 21, which is nested at a sliding fit in an annular groove in the back shell 22 of the chuck.

The back shell 22 is generally annular in shape, constructed to be fitted within the chuck rim 23 at the back, and to be secured in position by back shell screws 24, which penetrate the back shell, and screw into internally threaded openings in the chuck body 10.

The front of the chuck body is so shaped as to provide a raised ring around its circumference as best shown at 25 in Figs. 2 and 3. Cut through this ring and in the front surface of the chuck body are the radially disposed ways26 in which are guided the j aw-carriers 13; and in the outer portions of the jaw-carriers are grooves 27 into which fit, in such a way as to allow longitudinal movement of the jaw-carrier, the tongues or looking ribs 28, located on the inside surfaces of the ways out in the raised ring 25.

The jaw-carrier locking tongues 28 formed in the raised ring 25 provide a support at the outer ends of the jaw carriers and prevent any tendency of the jaws to be lifted or pressed out of their true position. Further, the presence of the raised ring 25 adds much thickness and strength to the chuck body.

The front surface of the jaw-carriers 13 is provided with internally threaded holes into which may be screwed the jaw screws 29, whose purpose is to secure the jaw 30 to the jaw-carrier as best shown in Figs. 1 and 3. The aw may be provided with a projecting tongue 31 which may engage a porresponding depression in the face of the jaw-carrier.

One of the advantages of our chuck lies in the fact that it is a solid body chuck, all the working parts being inserted either from the front or from the rear, and without the necessity of making any part of the chuck rim 23 separable from the main body 10. By providing the thrust collar 20, mounted as previously described upon the pinion shank 17 the direct end thrust resulting from the tightening of the jaws and their connected parts is borne not upon the back ends of the pinion teeth 19, as is usually the case in lathe chucks, but upon the thrust collar itself which abuts suitably shaped shoulders in the chuck body 10 and the back shell 22. When the end thrust referred to must be borne by the back ends of the pinion teeth, as in the case of chucks made previously to our invention herein disclosed, it was necessary to cut down the pinion shank (corresponding to the shank 17 to a sufliciently small diameter to eX- pose the entire depth of the pinion teeth. Otherwise, the teeth would break and necessitate frequent and troublesome repairs. By mounting the thrust collar 20 in the position shown herein, however, we are enabled to leave the pinion shank 17 with a com paratively large diameter, only cutting down the back ends of the pinion teeth a slight distance, since we have found that by mounting the thrust collar in the positiondescribed the back ends of the pinion teeth are protected from direct friction and strain, and through the medium of the collar, will bear without breakage longitudinal strain of the tightened jaws. Further advantages also accrue from this arrangement of elements, since by only being required to cut down the back ends of the pinion teeth a short distance, we are able to bring the bottom of the grooves between F the pinion teeth to the external surface of the pinion shank, as best shown at 33 in Fig. 3. i

In Figs. 4, 5 and 6 we have shown a modification of our jaw locking ribs, consisting of a generally T shaped projection 83, which may be inserted into the chuck face by providing an enlargement in the jaw-carrier way, best shown at 34 in Fig. 4'. When the jaw carrier occupies any of its normal positions, the T shaped projection 36 is retained securely under the projecting ribs 35 of the j aw-carrier ways, and thus the jaw-carrier and its jaw will be securely held against any movement relatively to the chuck body except the normal radial movement.

We claim 1. A chuck having a peripheral emboss- 4. In a chuck, work engaging means,

actuating means therefor including a pinion adapted to carry an end thrust collar free to turn with said pinion.

5. In a chuck, work engaging means, actuating means therefor including a pinion adapted to'carry an end thrust receiving means revoluble therewith.

6. In a chuck, work holding means and actuating means therefor including screw shafts, pinion teeth projecting from said shafts, collars fitting said shafts at the base of said teeth, said chuck having bearings cooperating with said collars.

7. In a chuck, work holding means, a radially disposed tongued way in which said means may travel, an enlargement of said way, and a projection integral with said work holding means adapted to be inserted through said enlargement and to be retained beneath the tongue of said way, as and for the purposes set forth.

In testimony whereof, we have signed our names to this specification, in the pres ence of two subscribing witnesses.

CLARENCE FREDERIC WCODFORD. CLIN S. ROCKWELL.

Witnesses:

JAMES DE FOREST PHELPS, SIDNEY ELLSWORTH HORTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

